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  1. theabsurdman

    Unequal numbers of cells in parallel groups?

    Imagine you had a 7s4p battery where one of the parallel groups was weaker (lower capacity) than the others. Is it allowable to add another cell to that parallel group (only) to boost it up? So that group would become 5p, which might now make it the strongest group in the pack. Are there any...
  2. theabsurdman

    Converting a 10s6p battery pack into a 7s9p

    I have a 10s6p e-bike pack that I want convert into a 7s9p without completely breaking down the pack so I have cut the nickel strip series string at 7s and am redistributing the cells from 8s-10s back to 1s-7s in parallel-connected groups of 3 by means of wires rated for 15A as illustrated in...
  3. theabsurdman

    Connecting identical packs in parallel with a single BMS

    Hi, I want to connect 3 identical 6P packs' parallel strings together side-by-side to operate as a larger pack off a single BMS - 2 questions: 1/ would it be sufficient to make the nickel strip connections between packs, illustrated by red lines in the pic below, to just 4 cells out of each 6...
  4. theabsurdman

    Newbie question re. using a balance-charger in combination with a BMS

    Building my first e-bike pack, I plan to have a BMS and a bulk charger wired to the BMS, but I also want to be able to use a balance-charger periodically to monitor and fine-tune the state of the in-series groups. The question is how to connect the balance charger to the pack? Should I unplug...
  5. theabsurdman

    Just scored a 20 yo Giant Lafree Twist Lite

    No battery or charger, missing rear brake shoes and the SRAM 3-speed hub shifter held on with a zip tie - the seller wanted £200, I offered 100, arguing that, besides having to source battery and charger, I had no way of even knowing if the motor worked. We settled on 120. Somebody had...
  6. theabsurdman

    Giant Twist RS2 pedelec - can't (re)locate cadence sensor

    I recently acquired a pair of 10+ year old Giant pedelecs - a Twist Express and a Twist RS2 which are almost identical models except... The Express can be easily derestricted by relocating its cadence sensor mounted on the rear triangle detecting a magnet affixed to a rear wheel spoke but I...
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